package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * 自定义切面 用于实现公共字段自动填充
 */
@Aspect
@Component
@Slf4j
/**
 * 切面类
 */
public class AutoFillAspect {
    //切入点
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && args(obj,..)&& @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointcut(Object obj){
    }
    @Before("autoFillPointcut( obj)")
    public void autoFill(JoinPoint joinPoint, Object obj){
        log.info("开始进行公共字段填充");
        //获取当前数据库操作类型
         MethodSignature signature = (MethodSignature)joinPoint.getSignature(); //获取方法签名
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class); //获取方法上的注解对象
        OperationType operationType = autoFill.value(); // 获取操作类型
        //获取参数 -- 实体对象
        log.info("当前操作类型：{}", operationType);
        Object[] args = joinPoint.getArgs();
        if(args == null || args.length == 0){
            return;
        }
        Object entity = args[0];


        //准备赋值的数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();

        //根据当前的操作类型，为对应的属性通过反射赋值
        if(operationType == OperationType.INSERT){
            try {
                //为插入操作的字段赋值
                //setCreateTime(now);
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                //调用方法，为对应的属性赋值`
                setCreateTime.invoke(entity, now);
            }
            catch (Exception e) {
                e.printStackTrace();
            }
        }
        if(operationType == OperationType.UPDATE){
            try {
                //为更新操作的字段赋值
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
            }
            catch (Exception e) {
                e.printStackTrace();
            }
        }

    }
}
